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Lithium-sulfur battery anode material comprising porous metal and preparation method thereof

A technology of porous metal and positive electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low utilization rate of active materials, low power density, fast capacity decay, etc., to improve battery safety, high capacity, The effect of preventing the battery from overheating

Active Publication Date: 2012-10-10
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes to combine porous metal with elemental sulfur or lithium sulfide as the positive electrode (cathode) material of lithium-sulfur battery, aiming to overcome the problems of low utilization rate of active material, fast capacity decay and low power density of current lithium-sulfur battery shortcoming

Method used

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  • Lithium-sulfur battery anode material comprising porous metal and preparation method thereof
  • Lithium-sulfur battery anode material comprising porous metal and preparation method thereof
  • Lithium-sulfur battery anode material comprising porous metal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-84

[0040] The single metal chooses a nanoporous titanium sheet with bimodal channels.

[0041] The nanoporous metal titanium sheet is prepared by chemical dealloying method, and the specific process is as follows:

[0042] Mix aluminum and titanium at a weight ratio of 1:1, put them in a high-frequency induction furnace to melt and alloy them, and then use roller melt spinning equipment to form tablets. Generally, the thickness of the sheet is 20-100 μm, the width is 1-5 cm, and the length is 1-5 cm. The alloy was soaked in 20wt% NaOH solution until no gas came out.

[0043] The electrolytes are mixed organic solvents 1,3-dioxolane (DOL): ethylene glycol dimethyl ether (DME) = 1:1 (v:v) 1mol / L bistrifluoromethanesulfonic acid imide Lithium (LiTFSI) solution.

Embodiment 1

[0045] A lithium-sulfur battery positive electrode material containing porous metal, the specific process of adopting scheme 1 is as follows:

[0046] The preparation process of the nanoporous titanium sheet and the elemental sulfur composite pole piece is as follows: the nanoporous titanium sheet and the elemental sulfur are mixed in a weight ratio of 1:10, placed in a tube furnace, fed with argon, processed at 155°C for 12 hours, and heated to 300°C for 2 hours. Finally, the above-mentioned pole piece is cut into a pole piece of 1 cm×1 cm.

[0047] The negative pole piece is made of lithium metal.

Embodiment 2

[0049] A lithium-sulfur battery positive electrode material containing porous metal, the specific process of adopting scheme 2 is as follows:

[0050] The preparation process of the nanoporous titanium sheet and the elemental sulfur composite pole piece is as follows: the nanoporous titanium sheet and the elemental sulfur are mixed with a weight ratio of 1:10, placed in a tube furnace, argon is passed, and 155° C. is processed for 12 hours, and the temperature is raised to 300°C for 2 hours.

[0051] Using atomic layer deposition technology, deposit 2nm aluminum oxide Al on the nanoporous titanium sheet and elemental sulfur composite pole sheet 2 o 3 The cladding layer is finally cut into pole pieces of 1 cm×1 cm.

[0052] The negative pole piece is made of lithium metal.

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Abstract

The invention discloses lithium-sulfur battery anode material comprising porous metal. The porous metal is compounded with lithium sulfide so as to be used as the anode material of the lithium-sulfur battery. The invention also discloses a preparation method of the lithium-sulfur battery anode material comprising the porous metal. According to the invention, by utilizing the characteristics of high electric conductivity, high porosity, high specific surface area and the like of the porous metal, elemental sulfur or the lithium sulfide is filled into pores of the porous metal, metal / sulfur composite material can be manufactured, and the utilization rate of the elemental sulfur and the lithium sulfide and the multiplying performance of the composite electrode can be increased; and simultaneously, by utilizing the strong interaction between the porous metal and the elemental sulfur or the lithium sulfide, the elemental sulfur, the lithium sulfide or polysulfide generated in a charge-discharge process can be more firmly attached on the surface of the porous metal, the dissolution of the polysulfide in an electrolyte, the shuttle effect caused by the dissolution of the polysulfide in the electrolyte and the deactivation on an anode and a cathode by redox product of the polysulfide can be restrained, and the circulation stability of a metal / sulfur composite electrode and the lithium-sulfur battery can be increased.

Description

technical field [0001] The invention belongs to the field of battery technology. In particular, a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is the secondary battery with the best comprehensive performance at present, and has been widely used in portable electronic products such as mobile phones, digital cameras, notebook computers and electric tools. With the rapid development of various scales of energy storage power stations, electric vehicles, and smart grids, the requirements for the energy density and power density of lithium-ion batteries are also getting higher and higher. However, limited by the theoretical lithium storage capacity of the battery system and electrode materials, the specific energy of lithium-ion batteries will remain at 300Wh kg -1 the following. Therefore, it is difficult for a pure electric vehicle using a lithium-ion battery to achieve a driving range comparable ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王兆翔王雪锋陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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